Coating composition for glass containers

ABSTRACT

A coating composition for glass containers containing medium chain fatty acid triglyceride, medium chain fatty acid triglyceride and/or long chain unsaturated triglyceride and squalane, or (a) at least one selected from medium chain fatty acid triglyceride, long chain unsaturated triglyceride and liquid paraffin and (b) fatty acid isopropyl as essential ingredient(s).

This is a division, of application Ser. No. 07/723,979, filed on Jul. 1, 1991, U.S. Pat. No. 5,284,508.

BACKGROUND OF THE INVENTION

The present invention relates to a coating composition for glass containers, which is coated onto the outer surface upon recycling glass containers for beer, juice, mineral water, etc. to enhance the appearance as well as masking scratches.

The glass containers for beer, juice, mineral water, etc. are repeatedly used by a collection system. When repeatedly using these bottles, scratches can generate on the outer surface due to mutual rubbing of bottles in the filling and distribution process to injure the appearance and to decrease the commercial value of bottled beverages. Upon recycling, therefore, it is necessary to coat a coating agent onto the portion of scratches, thus masking the scratches inconspicuous and enhancing the appearance at the same time. The portions of bottles violently generating the scratches are approximately fixed; for example, in the case of common beer bottles in Japan, the generation of scratches are violent at the positions of 1 to 2 cm, 5 to 7 cm and 13 to 15 cm from the bottom. For this reason and other various conditions, partial coating such as two or three-stripe coating or the like, wherein the coating liquor is applied only onto the portions of violent scratches, is generally carried out. However, the scratches sometimes generate at positions other than those fixed positions, thus improvement in the working process is required for beautifully finishing even such portions.

In order to cope with such problems, some coating compositions for the scratches of glass containers have so far been proposed. For example, in Japanese Unexamined Patent Publication No. Sho 57-179053, a composition using dimethylpolysiloxane together with aminomethylpolysiloxane is disclosed. Also, in Japanese Unexamined Patent Publication No. Sho 59-145259, a composition having liquid paraffin as a major ingredient and using small amounts of higher alcohol fatty acid ester and polyhydric alcohol fatty acid ester in combination is disclosed. Furthermore, in Japanese Unexamined Patent Publication No. Sho 62-128951, a composition containing acetylated glycerine fatty acid ester as an essential ingredient has also been disclosed. While these are favorable compositions for said partial coating processes, they are unsuitable in several points when considering overall coating process by the shower or spray method of coating liquor or with sponge aiming at the improvement in the partial coating process and the beautiful finishing of overall bottle surface. If considering the coating liquor for overall coating, such matters that it dries rapidly, that it does not allow slippage where handled, that it does not adversely affect the label (exudation and easy stripping off) and that it allows good transportability (no rubbing in the printed area of label) are desired in addition to the performance desirable for the coating liquor by the conventional system (masking property, appearance, non-tackiness, water resistance and washing property).

The purpose of the invention is to provide a coating composition for glass containers having solved said problems.

As a result of diligent investigations for obtaining a coating composition for glass containers having solved said problems, the inventors have reached the invention.

SUMMARY OF THE INVENTION

It has been found that

(1) a composition having medium chain fatty acid triglyceride as an essential ingredient,

(2) a composition having medium chain fatty acid triglyceride and/or long chain unsaturated triglyceride and squalane as essential ingredients,

(3) a composition having (a) at least one selected from medium chain fatty acid triglyceride, long chain unsaturated triglyceride and liquid paraffin and (b) fatty acid isopropyl as essential ingredients, and

(4) the composition, the formulation ratio (by weight) of a/b under (3) aforementioned being 20/80 to 90/10 can solve said problems, leading to successfully coat bottle utilizable in industry.

DETAILED DESCRIPTION OF THE INVENTION

The medium chain fatty acid triglyceride (hereinafter abbreviated as MCT) to be used in the invention can be obtained by completely esterifying three hydroxyl groups of glycerine with 3 moles of medium chain fatty acid. The medium chain fatty acid includes saturated fatty acids with carbons of 8 to 12, concretely caprylic acid, capric acid and lauric acid. These fatty acids can be used solely or as mixtures.

The long chain unsaturated triglyceride to be used in the invention includes triglycerides comprising solely or mixed long chain unsaturated fatty acids, i.e. palmitoleic acid, oleic acid, elaidic acid, linolic acid and linolenic acid, or mixtures of these unsaturated fatty acids partially mixed with long chain saturated fatty acids (palmitic acid, stearic acid, etc.). As concrete examples, soybean oil, rape seed oil, olive oil, etc. may be mentioned, but the invention is not confined to these.

The squalane to be used in the invention is a saturated hydrocarbon obtainable through the reduction of hydrocarbon obtained from the liver oil of dogfish and other sharks living mainly in ocean depths, which coincides with the Japanese Standard of Cosmetic Ingredients.

The liquid paraffin to be used in the invention is a mixture of liquid hydrocarbons obtained from petroleum, which coincides with the Japanese Standard of Cosmetic Ingredients.

The fatty acid isopropyl to be used in the invention is fatty acid esters of isopropyl alcohol obtainable by reacting fatty acids derived from natural oils and fats, e.g. lauric acid, myristic acid, palmitic acid, oleic acid, etc., with isopropyl alcohol.

In the invention, the formulation ratio of ingredient (a) to ingredient (b) under (4) aforementioned is also important. If the formulation ratio of (a)/(b) is within a range of 0/100 to 20/80, some of the masking properties, appearance, water resistance and transportability would be insufficient in the coating performance required and, if the formulation ratio of (a)/(b) is within a range of 90/10 to 100/0, nontackiness, washing properties, drying properties and slip-down properties would be insufficient. Hence, in order to satisfy all of these performance, it is necessary for the formulation ratio of (a)/(b) to be within a range of 20/80 to 90/10.

The composition of the invention is used by emulsifying one or not less than two kinds of said ingredients into water. As the surfactant to be used as emulsified into water, the use of at least two kinds selected from nonionic surfactants including sorbitan fatty acid ester, polyoxyethylene sorbitan fatty acid ester, glycerine fatty acid ester, polyoxyethylene glycerine fatty acid ester, polyglycerine fatty acid ester, sucrose fatty acid ester, polyoxyethylene nonylphenyl ether, polyoxyethylene alkyl ether, etc. is desirable, but the invention is not confined to these.

The compositions of the invention are as under (1) through (4) aforementioned, but, as in (1) and (2), besides the essential ingredient(s), the combined use of small amount of, for example, dimethylsilicone oil and liquid paraffin being commonly used ingredients of coating agents for bottle does not hinder the invention.

Moreover, in the compositions of (3) and (4), besides the essential ingredients, the combined use of small amount of, for example dimethylsilicone oil being a commonly used ingredient of coating agents for bottle does not hinder the invention.

EXAMPLE 1 (1) Coating Method

Coating compositions as shown in Table 1 were converted to 10% emulsion with homogenizer. Into each of these solutions, a beer bottle with scratches after washing (dipping treatment into 2% aqueous solution of NaOH for 10 minutes at 70° C., then washing and drying) was momentarily dipped at room temperature and thereafter it was allowed to stand for a day in an airy place to give the coating.

(2) Evaluation Method (1) Masking property of scratched portions

Comparative judgment was made using a coated article with dimethylsilicone and a coated article with emulsified liquid paraffin as references.

2) Appearance of unscratched smooth surface

The coated state of clean smooth surface without scratches was observed.

3) Extensibility

What state the coating agent stayed in on the smooth glass surface was evaluated.

4) Tackiness and slip property

The tackiness and slip property when in the coated state were evaluated by touching with a tip of a finger.

5) Water resistance

After dipping a coated bottle into water for 24 hours at room temperature, it was taken out to evaluate the remaining state of coating agent.

6) Washing property

A coated bottle was treated for 10 minutes at 70° C. with aqueous solution of NaOH to observe the degree of washout of coating agent of the coated bottle.

7) Transportability

Coated bottles after labeling were placed in a plastic container, and subjected to the vibration test according to JIS Z0232 where the transportability (degree of rubbing of labels) has observed.

(3) Expression of evaluation ⊚Superior, ◯Excellent, ΔPoor, X Very poor .

                                      TABLE 1                                      __________________________________________________________________________     Coating composition                                                                   Composition (% by weight)                                                                              Others                                                 MCT*            Emulsifier**                                                                           Liquid                                                                              Dimethyl-                                                                            Soybean                                     No. 1                                                                              No. 2                                                                              No. 3                                                                              No. 4                                                                              A   B   paraffin                                                                            silicone oil                                                                         oil                                  __________________________________________________________________________     Inventive                                                                             90              8   2                                                   Article 1                                                                      Inventive  90          8   2                                                   Article 2                                                                      Inventive      90      8   2                                                   Article 3                                                                      Inventive                                                                             70              8   2   20                                              Article 4                                                                      Inventive          70  8   2        20                                         Article 5                                                                      Inventive          70  8   2              20                                   Article 6                                                                      Comparative                                                                           Silicone oil emulsion (TSM 6341/water = 25/75)                          Article 1                                                                      Comparative                                                                           Liquid paraffin/Tween 80/lauryl stearate/oleic acid                            monoglyceride/                                                          Article 2                                                                             water = 7.6/1.2/0.8/0.4/90                                              __________________________________________________________________________      *MCT is as follows:                                                            No. 1 Triglyceride of 100% caprylic acid                                       No. 2 Triglyceride of 100% capric acid                                         No. 3 Triglyceride of caprylic acid/capric acid = 60/40%                       No. 4 Triglyceride of caprylic acid/capric acid/lauric acid = 60/30/10%        **Emulsifier is as follows:                                                    A: Sorbitan oleate                                                             B: Sucrose oleic acid ester                                              

Effect of the Invention

Evaluations on the performance, safety and price of coating agents of the Inventive Articles 1 through 6 and the Comparative Articles 1 and 2 are shown in Table 2.

                                      TABLE 2                                      __________________________________________________________________________     Results of coating compositions                                                       Coating performance                                                                           Tackiness      Trans-                                           Masking                                                                             Appear-                                                                             Extensi-                                                                            and slip                                                                            Water                                                                               Washing                                                                             port-                                            property                                                                            ance bility                                                                              property                                                                            resistance                                                                          property                                                                            ability                                                                            Safety                                                                             Price                             __________________________________________________________________________     Inventive                                                                             ⊚                                                                    ◯                                                                       ⊚                                                                    ◯                                                                       ◯                                                                       ⊚                                                                    ⊚                                                                   ⊚                                                                   ◯                     Article 1                                                                      Inventive                                                                             ⊚                                                                    ◯                                                                       ⊚                                                                    ◯                                                                       ◯                                                                       ⊚                                                                    ⊚                                                                   ⊚                                                                   ◯                     Article 2                                                                      Inventive                                                                             ⊚                                                                    ◯                                                                       ⊚                                                                    ◯                                                                       ◯                                                                       ⊚                                                                    ⊚                                                                   ⊚                                                                   ◯                     Article 3                                                                      Inventive                                                                             ⊚                                                                    ◯                                                                       ⊚                                                                    ◯                                                                       ◯                                                                       ◯                                                                       ◯                                                                      ◯                                                                      ⊚˜.large                                                  circle.                           Article 4                                                                      Inventive                                                                             ⊚                                                                    ◯                                                                       ⊚                                                                    ⊚                                                                    ◯                                                                       ◯                                                                       ⊚                                                                   ◯                                                                      ◯˜Δ       Article 5                                                                      Inventive                                                                             ⊚                                                                    ◯                                                                       ⊚                                                                    ◯                                                                       ⊚                                                                    ⊚                                                                    ⊚                                                                   ⊚                                                                   ⊚˜.large                                                  circle.                           Article 6                                                                      Comparative                                                                           Δ                                                                             ◯                                                                       ⊚                                                                    ⊚                                                                    Δ                                                                             ◯                                                                       ◯                                                                      Δ                                                                            X                                 Article 1                                                                      Comparative                                                                           ⊚                                                                    Δ                                                                             ◯                                                                       Δ                                                                             ◯                                                                       X    Δ                                                                            Δ                                                                            ⊚                  Article 2                                                                      __________________________________________________________________________

As shown in this table, the Comparative Article 1 was inferior in the points of masking property, water resistance, safety and price and the Comparative Article 2 was inferior in the points of tackiness and slip property, washing property, transportability and safety, whereas the Inventive Articles 1 through 6 exhibited the results above the level in all items showing the progressiveness.

EXAMPLE 2 Coating Method

Coating compositions as shown in Table 3 were converted to 10% emulsion with a homogenizer. Into each of these solutions, a beer bottle with scratches after washing (dipping into 2% aqueous solution of NaOH for 10 minutes at 70° C., then washing and drying) was momentarily dipped at room temperature and thereafter was dried for 24 hours at 35° C. in a ventilated place.

Evaluation Method 1) Masking property of scratched portions

Comparative judgment was made using Comparative Articles 3 through 7 in Table 3 as references.

2) Tackiness

The coated surface was evaluated by touching with the tip of a finger.

(3) Drying property

The drying state was evaluated after a beer bottle was treated with coating liquor for 30 minutes at 35° C. in ventilated environment.

4) Slip-Down property of coated bottle

A beer bottle coated by the method as mentioned above was filled up with water and the degree of slip-down of bottle from hand when lightly seized by the trunk portion of the bottle was evaluated.

Besides, the appearance of the unscratched smooth surfaces, extensibility, water resistance, washing property, transportability and the expression of evaluation were made similar to Example 1.

                                      TABLE 3                                      __________________________________________________________________________     Coating compositions                                                                                  Auxiliary                                                      Major ingredient        Others                                                      Triglyceride                                                                              Emulsifier*                                                                            Liquid                                                                              Dimethyl-                                         Squalane                                                                            Caprylate                                                                            Olive oil                                                                           A  B  C paraffin                                                                            silicone oil                               __________________________________________________________________________     Inventive                                                                             10   80         8     2                                                 Article 7                                                                      Inventive                                                                             10   55    20      12 3                                                 Article 8                                                                      Inventive                                                                             30         55   12    3                                                 Article 9                                                                      Inventive                                                                             15   70         6  6  3                                                 Article 10                                                                     Inventive                                                                             20   30    15   6  6  3 20                                              Article 11                                                                     Inventive                                                                             20   30    15   6  6  3 10   10                                         Article 12                                                                     Inventive                                                                             20   30    15   6  6  3      20                                         Article 13                                                                     Comparative            6  6  3 85                                              Article 3                                                                      Comparative            6  6  3      85                                         Article 4                                                                      Comparative                                                                           85              6  6  3                                                 Article 5                                                                      Comparative 85         6  6  3                                                 Article 6                                                                      Comparative       85   6  6  3                                                 Article 7                                                                      __________________________________________________________________________      *Emulsifier is as follows:                                                     A: Sorbitan oleate                                                             B: Polyoxyethylene nonylphenyl ether                                           C: Polyoxyethylene sorbitan oleate                                       

Effect of the Invention

The comparative evaluation on the results of coating compositions of the Inventive Articles 7 through 13 and the Comparative Articles 3 through 7 is shown in Table 4.

                                      TABLE 4                                      __________________________________________________________________________     Results of coating compositions                                                           Masking                                                                             Appear-                                                                             Extens-                                                                            Tack-                                                                              Water                                                                               Washing                                                                             Drying                                                                              Slip-down                                                                            Trasnport-                              property                                                                            ance ibility                                                                            iness                                                                              resistance                                                                          property                                                                            property                                                                            property                                                                             ability                      __________________________________________________________________________     Inventive Article 7                                                                       ◯                                                                       ◯                                                                       ⊚                                                                   ⊚                                                                   ⊚                                                                    ⊚                                                                    ⊚                                                                    ◯                                                                        ⊚             Inventive Article 8                                                                       ⊚                                                                    ◯                                                                       ⊚                                                                   ◯                                                                      ◯                                                                       ⊚                                                                    ◯                                                                       ◯                                                                        ⊚             Inventive Article 9                                                                       ⊚                                                                    ◯                                                                       ⊚                                                                   ◯                                                                      ◯                                                                       ⊚                                                                    ◯                                                                       ◯                                                                        ⊚             Inventive Article 10                                                                      ◯                                                                       ◯                                                                       ⊚                                                                   ⊚                                                                   ◯                                                                       ⊚                                                                    ⊚                                                                    ⊚                                                                     ⊚             Inventive Article 11                                                                      ⊚                                                                    ◯                                                                       ◯                                                                      ◯                                                                      ⊚                                                                    ◯                                                                       ◯                                                                       ◯                                                                        ◯                Inventive Article 12                                                                      ⊚                                                                    ◯                                                                       ⊚                                                                   ◯                                                                      ◯                                                                       ◯                                                                       ◯                                                                       ◯                                                                        ◯                Inventive Article 13                                                                      ⊚                                                                    ◯                                                                       ⊚                                                                   ⊚                                                                   ◯                                                                       ⊚                                                                    ⊚                                                                    ◯                                                                        ⊚             Comparative Article 3                                                                     ⊚                                                                    ◯                                                                       ◯                                                                      X   ⊚                                                                    X    X    X     Δ                      Comparative Article 4                                                                     Δ                                                                             ◯                                                                       ⊚                                                                   ⊚                                                                   ◯                                                                       Δ                                                                             Δ                                                                             ◯                                                                        ◯                Comparative Article 5                                                                     X    Δ                                                                             ⊚                                                                   ⊚                                                                   ⊚                                                                    Δ                                                                             ⊚                                                                    ⊚                                                                     ⊚             Comparative Article 6                                                                     ◯                                                                       Δ                                                                             Δ                                                                            ◯                                                                      Δ                                                                             ⊚                                                                    Δ                                                                             ◯                                                                        ⊚             Comparative Article 7                                                                     ⊚                                                                    ◯                                                                       Δ                                                                            X   ◯                                                                       ⊚                                                                    Δ                                                                             X     ◯                __________________________________________________________________________

As shown in this table, the Comparative Articles 3 through 7 had Δ to × for three items or more among eight items of coating performance. Whereas, the Inventive Articles 7 through 13 exhibited the results above the level for all of eight items showing the progressiveness.

EXAMPLE 3 Coating Method

Coating compositions as shown in Table 5 were converted to 12% emulsion with a homogenizer. Into each of these solutions, a beer bottle with scratches after washing (dipping into 2% aqueous solution of NaOH for 10 minutes at 70° C., then washing and drying) was momentarily dipped at room temperature and thereafter it was dried for 24 hours at 35° C. in a ventilated environment.

Evaluation Method Masking Property of Scratched Portions

Comparative judgment was made using Comparative Articles 8 through 16 in Table 5 as references.

Besides, the appearance of unscratched smooth surface, extensibility, tackiness, water resistance, washing property, drying property, slip-down property of coated bottle, transportability and the expression of evaluation were made similar to Example 1 and 2.

                                      TABLE 5                                      __________________________________________________________________________     Coating compositions                                                                       Major ingredient                     Auxiliary                                 Fatty acid isopropyl                                                                             Triglyceride       Emulsifier*.sup.1                         Lauric                                                                             Myristic                                                                            Palmitic                                                                            Oleic                                                                              Caprylate                                                                            Olive oil                                                                           Liquid paraffin                                                                        A B  C Silicone                                                                       oil*.sup.2             __________________________________________________________________________     Inventive Article 14                                                                           15            70                 6 6  3                        Inventive Article 15                                                                           30            55                 6 6  3                        Inventive Article 16                                                                           40            35    10           6 6  3                        Inventive Article 17                                                                           55                  30           6 6  3                        Inventive Article 18                                                                           65                       20      6 6  3                        Inventive Article 19                                                                           30            40         15      6 6  3                        Inventive Article 20                                                                           25            45          7      6 6  3  8                     Inventive Article 21                                                                           20            50                 6 6  3 15                     Inventive Article 22                                                                       10  20            45    10           6 6  3                        Inventive Article 23                                                                           20   10       45                 6 6  3 10                     Inventive Article 24      30  45                 6 6  3 10                     Inventive Article 25                                                                            5   20    5  40                 6 6  3 15                     Comparative Article 8                    85      6 6  3                        Comparative Article 9                            6 6  3 85                     Comparative Article 10                                                                         85                               6 6  3                        Comparative Article 11    85                     6 6  3                        Comparative Article 12        85                 6 6  3                        Comparative Article 13              85           6 6  3                        Comparative Article 14                                                                          5            80                 6 6  3                        Comparative Article 15                                                                          5                       80      6 6  3                        Comaprative Article 16                                                                         75            10                 6 6  3                        __________________________________________________________________________      *.sup.1 Type of emulsifier                                                     A: Sorbitan Sesquioleate                                                       B: Polyoxyethylene nonylphenyl ether                                           C: Polyoxyethylene (20) sorbitan oleate                                        *.sup.2 Silicone oil: Toshiba silicone TSF 451350                        

Effect of the Invention

The comparative evaluation on the results of coating compositions of the Inventive Articles 14 through 25 and the Comparative Articles 8 through 16 is shown in Table 6.

                                      TABLE 6                                      __________________________________________________________________________     Results of coating compositions                                                                                               Trans-                                 Masking                                                                             Appear-                                                                             Extensi-  Water                                                                               Washing                                                                             Drying                                                                              slip-down                                                                           port-                                  property                                                                            ance bility                                                                              Tackiness                                                                           resistance                                                                          property                                                                            property                                                                            property                                                                            ability                         __________________________________________________________________________     Inventive                                                                             ◯                                                                       ◯                                                                       ◯                                                                       ⊚                                                                    ◯                                                                       ⊚                                                                    ⊚                                                                    ⊚                                                                    ⊚                Article 14                                                                     Inventive                                                                             ◯                                                                       ◯                                                                       ⊚                                                                    ⊚                                                                    ◯                                                                       ⊚                                                                    ⊚                                                                    ⊚                                                                    ⊚                Article 15                                                                     Inventive                                                                             ◯                                                                       ◯                                                                       ⊚                                                                    ⊚                                                                    ◯                                                                       ⊚                                                                    ◯                                                                       ⊚                                                                    ◯                   Article 16                                                                     Inventive                                                                             ⊚                                                                    ◯                                                                       ⊚                                                                    ◯                                                                       ◯                                                                       ⊚                                                                    ◯                                                                       ⊚                                                                    ◯                   Article 17                                                                     Inventive                                                                             ⊚                                                                    ◯                                                                       ◯                                                                       ◯                                                                       ⊚                                                                    ◯                                                                       ◯                                                                       ◯                                                                       ◯                   Article 18                                                                     Inventive                                                                             ⊚                                                                    ◯                                                                       ◯                                                                       ◯                                                                       ⊚                                                                    ◯                                                                       ◯                                                                       ◯                                                                       ◯                   Article 19                                                                     Inventive                                                                             ⊚                                                                    ◯                                                                       ◯                                                                       ◯                                                                       ⊚                                                                    ◯                                                                       ◯                                                                       ◯                                                                       ⊚                Article 20                                                                     Inventive                                                                             ◯                                                                       ◯                                                                       ◯                                                                       ⊚                                                                    ◯                                                                       ◯                                                                       ⊚                                                                    ⊚                                                                    ⊚                Article 21                                                                     Inventive                                                                             ◯                                                                       ◯                                                                       ◯                                                                       ⊚                                                                    ◯                                                                       ⊚                                                                    ◯                                                                       ⊚                                                                    ◯                   Article 22                                                                     Inventive                                                                             ◯                                                                       ◯                                                                       ◯                                                                       ⊚                                                                    ◯                                                                       ◯                                                                       ⊚                                                                    ⊚                                                                    ⊚                Article 23                                                                     Inventive                                                                             ⊚                                                                    ◯                                                                       ◯                                                                       ◯                                                                       ◯                                                                       ◯                                                                       ◯                                                                       ◯                                                                       ⊚                Article 24                                                                     Inventive                                                                             ◯                                                                       ◯                                                                       ◯                                                                       ⊚                                                                    ◯                                                                       ◯                                                                       ⊚                                                                    ⊚                                                                    ⊚                Article 25                                                                     Comparative                                                                           ◯                                                                       Δ                                                                             Δ                                                                             X    ⊚                                                                    X    X    X    Δ                         Article 8                                                                      Comparative                                                                           X    Δ                                                                             ◯                                                                       ◯                                                                       ◯                                                                       Δ                                                                             Δ                                                                             Δ                                                                             ◯                   Article 9                                                                      Comparative                                                                           Δ                                                                             Δ                                                                             ◯                                                                       ◯                                                                       X    ⊚                                                                    ⊚                                                                    ⊚                                                                    Δ                         Article 10                                                                     Comparative                                                                           ◯                                                                       Δ                                                                             ◯                                                                       Δ                                                                             Δ                                                                             ⊚                                                                    Δ                                                                             ◯                                                                       Δ                         Article 11                                                                     Comparative                                                                           ◯                                                                       Δ                                                                             Δ                                                                             ◯                                                                       Δ                                                                             ⊚                                                                    Δ                                                                             Δ                                                                             ⊚                Article 12                                                                     Comparative                                                                           ◯                                                                       ◯                                                                       Δ                                                                             X    ◯                                                                       ⊚                                                                    Δ                                                                             X    ◯                   Article 13                                                                     Comparative                                                                           ◯                                                                       Δ                                                                             Δ                                                                             ◯                                                                       Δ                                                                             ⊚                                                                    Δ                                                                             Δ                                                                             ⊚                Article 14                                                                     Comparative                                                                           ◯                                                                       ◯                                                                       ◯                                                                       X    ◯                                                                       X    X    X    Δ                         Article 15                                                                     Comparative                                                                           Δ                                                                             Δ                                                                             ◯                                                                       ◯                                                                       Δ                                                                             ⊚                                                                    ⊚                                                                    ⊚                                                                    Δ                         Article 16                                                                     __________________________________________________________________________

As shown in this table, the Comparative Articles 8 through 16 had Δ to × for four items or more among nine items of coating performance. Whereas, the Inventive Articles 14 through 25 exhibited the results above the level for all of nine items showing the progressiveness. 

What is claimed is:
 1. A scratch masking composition for glass containers consisting of (a) at least one member selected from the group consisting of medium chain C₈ -C₁₂ fatty acid triglycerides and long chain C₁₆ -C₂₂ unsaturated fatty triglycerides, and (b) a fatty acid isopropyl.
 2. The scratch masking composition for glass containers of claim 1 wherein said components (a) and (b) are present in the ratio (by weight) of (a)/(b) from 20/80 to 90/10.
 3. A scratch masking emulsion comprising a scratch masking composition in accordance with claim 1 and a surfactant. 